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Constraint perturbation method for shape design and configuration selection of structures

结构形状设计与构型选择的约束摄动法

基本信息

批准号：
05452251
负责人：
NAKAMURA Tsuneyoshi
金额：
$ 3.33万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

1.A constraint perturbation method has been developed for finding optimal topology of a space truss subjected to asymmetric loads. The designs are traced with respect to the lower-bound cross-sectional areas. The method has been extended to find an optimal structural form of a braced plane frame.2.A method of generating sequences of seismic response constrained designs has been presented for trusses assembled to make large-span frames. The truss is subjected to a set of multi-component earthquake motions. Geometrical parameters are considered as design variables to find designs which satisfy the constraints on maximum response strains and accelerations.3.A new theory has been developed for generating a sequence of building frames with dampers such that the maximum interstory drifts under strong earthquakes exhibit almost uniform distribution. The designs are expanded with respect to a parameter representing the damping ratios of the viscous dampers.4.A straightforward method has been presented for shape design of cable networks with friction-free joints subjected to pretensioning forces. A design such that all the nodes exist in a plane is chosen as trivial initial design and a sequence of designs are expanded with respect to a boundary shape parameter.5.An inverse perturbation method has been developed for a base-isolated shear building model subjected to strong earthquakes. A sequence of designs is generated so that the maximum interstory drifts and top-floor acceleration are equal to the specified values.6.A design method has been developed for a shear building model supported by a pile-soil system. A sequence of stiffness designs are generated with respect to a ground stiffness parameter. This method utilizes a design for a stiff ground as an initial design and is applicable to the case where the fundamental natural period of the building and the ground are closely spaced and where the gound stiffness have estimation variability.

1.提出了约束摄动法求解受非对称载荷作用的空间桁架的最优拓扑。这些设计是相对于下界横截面积进行跟踪的。将该方法推广到寻找支撑平面框架的最优结构形式。提出了一种生成大跨度框架桁架地震反应约束设计序列的方法。桁架承受一系列多分量地震运动。将几何参数作为设计变量，寻找满足最大响应应变和最大响应加速度约束的设计方案。提出了一种新的理论，用于产生具有阻尼器的建筑框架序列，使强震下的最大层间位移几乎均匀分布。根据一个表示粘性阻尼器阻尼比的参数，对设计进行了扩展。提出了一种具有无摩擦节点的索网在张紧力作用下的形状设计方法。选择所有节点都存在于一个平面上的设计作为平凡初始设计，并根据边界形状参数展开一系列设计。针对强震作用下的基础隔震剪力建筑模型，提出了一种逆摄动方法。生成一系列设计，使最大层间漂移和顶楼加速度等于规定值。提出了桩-土体系剪力建筑模型的设计方法。根据地面刚度参数生成一系列刚度设计。该方法采用刚性地面作为初始设计，适用于建筑物和地面的基本自然周期紧密间隔以及地面刚度具有估计可变性的情况。